Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1002/ieam.1508
Titel (primär) Passive sampling methods for contaminated sediments: scientific rationale supporting use of freely dissolved concentrations
Autor Mayer, P.; Parkerton, T.F.; Adams, R.G.; Cargill, J.G.; Gan, J.; Gouin, T.; Gschwend, P.M.; Hawthorne, S.B.; Helm, P.; Witt, G.; You, J.; Escher, B.I.
Quelle Integrated Environmental Assessment and Management
Erscheinungsjahr 2014
Department ZELLTOX
Band/Volume 10
Heft 2
Seite von 197
Seite bis 209
Sprache englisch
Keywords Bioavailability; Chemical activity; Passive sampling; Sediments; Risk assessment; ecological risk
Abstract Passive sampling methods (PSMs) allow the quantification of the freely dissolved concentration (Cfree) of an organic contaminant even in complex matrices such as sediments. Cfree is directly related to a contaminant's chemical activity, which drives spontaneous processes including diffusive uptake into benthic organisms and exchange with the overlying water column. Consequently, Cfree provides a more relevant dose metric than total sediment concentration. Recent developments in PSMs have significantly improved our ability to reliably measure even very low levels of Cfree. Application of PSMs in sediments is preferably conducted in the equilibrium regime, where freely dissolved concentrations in the sediment are well-linked to the measured concentration in the sampler via analyte-specific partition ratios. The equilibrium condition can then be assured by measuring a time series or a single time point using passive samplers with different surface to volume ratios. Sampling in the kinetic regime is also possible and generally involves the application of performance reference compounds for the calibration. Based on previous research on hydrophobic organic contaminants, it is concluded that Cfree allows a direct assessment of 1) contaminant exchange and equilibrium status between sediment and overlying water, 2) benthic bioaccumulation, and 3) potential toxicity to benthic organisms. Thus, the use of PSMs to measure Cfree provides an improved basis for the mechanistic understanding of fate and transport processes in sediments and has the potential to significantly improve risk assessment and management of contaminated sediments.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=19327
Mayer, P., Parkerton, T.F., Adams, R.G., Cargill, J.G., Gan, J., Gouin, T., Gschwend, P.M., Hawthorne, S.B., Helm, P., Witt, G., You, J., Escher, B.I. (2014):
Passive sampling methods for contaminated sediments: scientific rationale supporting use of freely dissolved concentrations
Integr. Environ. Assess. Manag. 10 (2), 197 - 209 10.1002/ieam.1508